Chuck



Dec. 17, 1929. w. J. SNYDER ET A1. 1,740,377

CHUCK Filed may 25, 1928 lil @al Illu /g 5 www??? 25m/f" @f @Wm EJMQM!L4 @Mam l f fm @www v fl/btamqo Patented Dec. 17, 1929 UNITED STATESPATENT OFFICE WILLIAM J OHN SNYDER AND EDW'ARD C. AHLI-IEIM, OFFRANKLIN, PENNSYLVANIA inwardly from the peripheral edges thereof,

to the disk 7.

CHUCK Application filed May 25,

The invention relates to work driving chucks and more particularly toone designed primarily for use in boiler work for either rapidly drivingor removing stay bolts. It is usually customary to perform this work byhand but we are aware that one stay bolt driver has been designed forthe purpose of rotating the bolts by power. This device, however,necessitates that the bolts be squared on one end, entailing anadditional and appreciable expense.

It is the object of the invention to provide a generally improvedconstruction, in which novel provision is made for retractf ing the jawsand in which said jaws are provided with unique bearing means for enga-ging cams by which they are projected.

With the foregoing in view, the invention resides in the novel subjectmatter hereinafter described and claimed, description being accomplishedby reference to the accompanying drawing.

Fig. 1 is a vertical sectional view on line 1-1 of Fig. 2 partly inelevation.

Figs. 2 and 3 are horizontal sectional views on lines 2- 2 and 3-3respectively of Fig. 1.

Fig. 4 is a side elevation of a portion of the head and its drivingshank.

Fig. 5 is a bottom plan view ot' the part shown in Fig. 4r.

The chuck embodies a head denoted in a general way by the numeral 6,said head including upper and lower relatively thick and thin disks 77,a circular wall 8 between and concentric with said disks and spaced saidwall being integral with the disk 7, and means such as the screws 9,securing the disk 7 to said wall 8. Disk 7 is integral with a drivingshank 10, disk 7 is formed with a work-receiving opening 11, and wall 8is formed with a plurality of radial slots 12 opening through both itsinner and outer peripheries, and extending from the disk 7 The innerside of wall 8 is formed with upper and lower grooves 13-14 adjacent thedisks 7*7, and around i said wall near the periphery of the disk 7, theinner side of the latter is formed with `a continuous rib 15. Theperiphery of disk 1928. serial No. 280,500.

7 is formed with a circumferential groove 16 and with an outstanding rib16 above said groove. The center of the disk 7 carries a hardened thrustbutton 17 for contact with the work which passes through the opening 11,saidbutton having a reduced portion securely held in a socket in saiddisk.

VVork-gripping jaws 18 are slidably mounted in the slots 12 in abuttingrelation with the disks 7-7, and at their inner ends are provided withappropriate curved and serrated work-engaging faces, said inner endsbeing also formed with notches 19-20 which register with the grooves1314. Self-expanding spring rings 22 are received in the notches 1920and the registering grooves 13--14 and serve to exert a constant outwardforce tending to retract or release the jaws 18. The outer ends of thejaws 18 are formed with vertical grooves 23 receiving bearing balls 211.These balls contact with the inner side of a ring 25 which rotatablysurrounds the wall 8, extends across the groove 16, and at its upperedgeabuts rib 16. The lower edge of ring 25 is formed with a groove 15receiving the rib 15. As the springs 22 constantly force the jaws 18outwardly, they maintain the'balls 24 in contact with the ring 25 andhence` said balls are prevented from accidentally falling out of thegrooves 23. The inner side of ring 25 is provided with a plurality ofcams 27 tor inwardly projecting the jaws 18 when the ring is turned inone direction and is also formed with a plurality of cams 28 forinwardly project' ing the jaws 18 when the ring is turned in the otherdirection. Two coiled compression springs 293O are disposed in thegroove 16 and at one end abut a stop 31 therein` The other ends oi thesesprings abut a stop 32 on the ring 25 and serve to hold said ring in itsmaximum jaw-projecting position. Turning ofthe ring in either directionper mits springs 22 to retract the jaws for initial positioning oi'lsaid jaws around the work, and release ot said ring, causes one or theother of the springs 29--30 to again turn said ring in jaw-projectingdirection. Ring 25 is turned in one direction when the work is to berotated clockwise and in the other tne opening ll.

direction for counterclockwise rotation of the work.

In assembling the chuck, the springs 29-30 are disposed in the groove 16against the stop 31, the ring 25 is positioned and the stop 32 insertedand secured. Then, with the structure inverted, the jawsl8 arepositioned in the slots l2 and the springs 2l22are placed in position tooutwardly :torce said jaws. These jaws may nowv be inwardly `pulled topermit dropping of the bearing balls Zlinto the grooves 23 and when thishas been done, the disk 7 is secured in place by the screws 9 or otherdesired means provided for this pur-V pose. The chuck thus lends itselfto quick and easy assembly andlfinay be disassembled with equal easewhenever repairs are necessary.

In operating the chuck, ringiis turnedto effect retraction of the aws18, the `bolto-r the like to 13e-driven is `started Iintoitsreceiving.openingv and the `chuck head' is positioned so that the thrust buttonlirests uponthe outer end oi. the bolt, the "latter passing throughTherifng is now released andfone or `the other of the springs -29-.301turns saidring7 causingone vorthe :other set` of its 'cams 277-28 toinwardly forcethe balls 24 and the aws 1S, `thus'engaging)thesejaws withthe work so thatthelatter maybe driven. Then thework is almostcompletely driven, the operator. slows-down the :driving ofthe chuck andiinally stops it; landsaid "chuck is. then released r'byfagain turning:the ringf.

I/Vhen removing bolts :or the like lor driving other parts in a reversedirection. from' that above explained, it is simply necessary to reversethe direction ofrotationofthel head f5 and to turn ring 25 in the`otherdi'rec-v tion Vto engage the chuck.A with `the work. Thereafter,all parts functionl exactlyv as. above explained, eXceptthat; the set-0f"cams which was previously idle `andI theV previously idle spring(2Q-#30) now. come yinto play to project the jaws 18. y

llhe device is extremely simpleand. c0111-, pact, may be inexpensively.manufactured and sold atlsmall cost, in numero-us'fields of-'duty willbe oi'vexceptional` advantage, and i whenusedas a stay-bolt driverysaveswork andiniaT terial now necessary-in constructingthe 'stay-v bolts orthe drivers heretofore'used @nadV count of such characteristics,weprefertoxemf.

j ploy the constructions shown. -HOW-ever, within the scopeof;the'=inventio`n as claimed,

variations may be made asa-bovestated.

l. In achuck,V ahead havingftwolaxially. alined disks l disposed :.inparallel planes,- and a. circular wall :concentric with said disks andextending between them infinwardly;spaced relation with` the peripheral`j-edges thereof; said wall vb"ejingiiorm'ed yv'vit'h internal groovesVnear said disks and 'tha-ving .fradial -slots from. its innerto-itsouter `side-and extending from lmmmtmmdmmmmmmlwgf l l one disk to theother; a ring surrounding and outwardly spaced from said wall androtatably mounted between the peripheral portions of said disks, theinner side of said ring having cams, work-gripping jaws slidable in saidslots and disposed in abutting relation with said disks, the outerendsof said jaws being co-Operable with said cams, Zand the inner endsof said jaws being formed with notches registering with the aforesaidgrooves; and self-exp'ansi'ble rings in said notches and grooves foroutwardly sliding said jaws.

2. In av chuelga head having two axially alined disks disposed inparallel planes, and a circular wallconcen-tric with said disks sandextend-ing between them ininwarc'lily spaced: relation with theperipheral,edges thereof, saidr wall having radiali slots from. itsBinner to its outerfside and extendinglfrom one adisk` 81 tovthejotfher; a ringv surrounding and fouti wardly spaced from said:wallandhrotatably mounted betweenthe periph'eralsportions Toffe' saiddisks, the inner sideof `saidnring:hav-fingcams, work-igrippingjawsslidable inrsaidl 99' slots and disposed in abuttingfrelationywithsaiddisks, the outer endsoztsaid jawvsbeing Jformed with. grooves from'one disk to 'the other, and bearing members .,in stride-grooves @fsa-idjawsfan'd held ,therein 'by contact with'.y said disks andfsaidcams. i l

In testimony whereof]- wey .have hereunto axed oursigna-tures. j

WILLIAM; JOHN SNYDER. EDWARD; GHAS:` AHLHEIM;

.ist

